Listen-before-talk reservation scheme for wireless communications over unlicensed spectrum
First Claim
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1. A method for wireless communications, comprising:
- synchronizing, in an aligned clear channel assessment (CCA) period comprising a plurality of Orthogonal Frequency-Division Multiplexing (OFDM) symbol positions, CCA slots to determine availability of a shared spectrum for transmissions in a next transmission interval, wherein a first CCA slot of the CCA slots is aligned with a first OFDM symbol position of the plurality of OFDM symbol positions and a second CCA slot of the CCA slots is aligned with a second OFDM symbol position of the OFDM symbol positions.
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Abstract
Methods and apparatuses are described in which an unlicensed spectrum is used for Long Term Evolution (LTE) communications. A first method includes synchronizing clear channel assessment (CCA) slots across a plurality of base stations to determine availability of an unlicensed spectrum for transmissions in a next transmission interval. A second method includes performing a CCA during one of a plurality of CCA slots synchronized across a plurality of evolved Node Bs (eNBs) to determine availability of unlicensed spectrum for transmissions in a next transmission interval.
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Citations
45 Claims
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1. A method for wireless communications, comprising:
synchronizing, in an aligned clear channel assessment (CCA) period comprising a plurality of Orthogonal Frequency-Division Multiplexing (OFDM) symbol positions, CCA slots to determine availability of a shared spectrum for transmissions in a next transmission interval, wherein a first CCA slot of the CCA slots is aligned with a first OFDM symbol position of the plurality of OFDM symbol positions and a second CCA slot of the CCA slots is aligned with a second OFDM symbol position of the OFDM symbol positions. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for wireless communications, comprising:
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a processor; memory in electronic communication with the processor; and instructions stored in the memory, the instructions being executable by the processor to; synchronize, in an aligned clear channel assessment (CCA) period comprising a plurality of Orthogonal Frequency-Division Multiplexing (OFDM) symbol positions, CCA slots to determine availability of a shared unlicensed spectrum for transmissions in a next transmission interval, wherein a first CCA slot of the CCA slots is aligned with a first OFDM symbol position of the plurality of OFDM symbol positions and a second CCA slot of the CCA slots is aligned with a second OFDM symbol position of the OFDM symbol positions. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A non-transitory computer-readable medium storing instructions executable by a computer, comprising:
instructions for causing the computer to synchronize, in an aligned clear channel assessment (CCA) period comprising a plurality of Orthogonal Frequency-Division Multiplexing (OFDM) symbol positions, CCA slots to determine availability of a shared spectrum for transmissions in a next transmission interval, wherein a first CCA slot of the CCA slots is aligned with a first OFDM symbol position of the plurality of OFDM symbol positions and a second CCA slot of the CCA slots is aligned with a second OFDM symbol position of the OFDM symbol positions. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A method for wireless communications, comprising:
performing, in an aligned clear channel assessment (CCA) period comprising a plurality of Orthogonal Frequency-Division Multiplexing (OFDM) symbol positions, a CCA during one of a plurality of synchronized CCA slots to determine availability of shared spectrum for transmissions in a next transmission interval, wherein a first CCA slot of the synchronized CCA slots is aligned with a first OFDM symbol position of the plurality of OFDM symbol positions and a second CCA slot of the synchronized CCA slots is aligned with a second OFDM symbol position of the OFDM symbol positions. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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30. An apparatus for wireless communications, comprising:
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a processor; memory in electronic communication with the processor; and instructions stored in the memory, the instructions being executable by the processor to; perform, in an aligned clear channel assessment (CCA) period comprising a plurality of Orthogonal Frequency-Division Multiplexing (OFDM) symbol positions, a CCA during one of a plurality of synchronized CCA slots to determine availability of shared spectrum for transmissions in a next transmission interval, wherein a first CCA slot of the synchronized CCA slots is aligned with a first OFDM symbol position of the plurality of OFDM symbol positions and a second CCA slot of the synchronized CCA slots is aligned with a second OFDM symbol position of the OFDM symbol positions. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37)
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38. A non-transitory computer-readable medium storing instructions executable by a computer, comprising:
instructions for causing the computer to perform, in an aligned clear channel assessment (CCA) period comprising a plurality of Orthogonal Frequency-Division Multiplexing (OFDM) symbol positions, a CCA during one of a plurality of synchronized CCA slots to determine availability of shared spectrum for transmissions in a next transmission interval, wherein a first CCA slot of the synchronized CCA slots is aligned with a first OFDM symbol position of the plurality of OFDM symbol positions and a second CCA slot of the synchronized CCA slots is aligned with a second OFDM symbol position of the OFDM symbol positions. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45)
Specification